Revisit Bootstrapping and Nested Apps

[ragboyjr]

1. Some bootstraps shouldn't run for nested apps
2. We might want to have app modes that determine how bootstrap happens. Maybe add a parameter to the bootstrap func which takes in a mode like cli or web or nested, etc...
3. It would also be great if services were registered lazily. So we wouldn't actually register service providers until bootstrap. And if we did nested apps more frequently, if you split your app into multiple parts, then it would cut down on the overhead.

[ragboyjr]

I think another approach would be to utilize events to trigger certain bootstrapping.